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Chapter 5, Section 4 Monitoring Faults Friday, February 19, 2010 Pages 168 -- 171.

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Presentation on theme: "Chapter 5, Section 4 Monitoring Faults Friday, February 19, 2010 Pages 168 -- 171."— Presentation transcript:

1 Chapter 5, Section 4 Monitoring Faults Friday, February 19, 2010 Pages

2 Objectives Discover how geologists monitor faults. Understand how geologists determine earthquake risk.

3 Monitoring Faults Geologists place instruments that measure stress and deformation in the crust.  This is a means that geologists use to try to predict when and where an earthquake will occur.  Highest risks areas are determined by locating faults that are active and where past earthquakes have occurred.

4 Fault Monitoring Devices Four instruments are used to monitor faults.  Creep meters  Laser-ranging devices  Tiltmeters  Satellites

5 Creep Meters Creep meters use a wire stretched across a fault to measure sideways movement of the ground.

6 Laser-Ranging Devices Laser-ranging devices use a laser beam that bounces off a reflector that detects even the slightest fault movements.

7 Tiltmeters Tiltmeters measures how much the ground has tipped along a fault.

8 Satellites Satellites use radio waves to bounce off the ground to measure changes in elevation.

9 Homework Workbook Monday, 2/22 Vocabulary Quiz Wednesday, 2/24


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